自定义placeholder的样式和颜色

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     .tes ::-webkit-input-placeholder
      {
        color: red;
        text-indent: .4rem;
        font-size: .50rem;
      }
      /*firefox 4-18*/
      :-moz-placeholder
      {
         color: red; text-indent: .4rem; font-size: .50rem;
      }
      /*firefox 19+*/
      ::-moz-placeholder
      {
         color: red; text-indent: .4rem; font-size: .50rem;

      }
      /*ie*/
      :-ms-input-placeholder
      {
         color: red; text-indent: .4rem; font-size: .50rem;
      }